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Finding the Fourth Proportional to 121,642.62, 166,407.98 and 121,130.30

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Solution

The fourth proportional to 121,642.62, 166,407.98 and 121,130.30 is: 165,707.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,642.62 : 166,407.98 = 121,130.30 : x
  2. Step 2: Convert to fraction form
    121,642.62/166,407.98 = 121,130.30/x
  3. Step 3: Cross multiply
    121,642.62x = 166,407.98 × 121,130.30
  4. Step 4: Simplify right side
    121,642.62x = 20,157,047,102.10
  5. Step 5: Solve for x
    x = 20,157,047,102.10/121,642.62
  6. Step 6: Final answer
    x = 165,707.11

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.